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    STP1572

    Microstructural Changes in Highly Irradiated 15Kh2MFA Steel

    Published: 2014


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    Abstract

    15Kh2MFA-type steel forgings were irradiated in an accelerated surveillance position of a power reactor, up to about 1 × 1021n/cm2, E > 1 MeV with medium flux. This steel is a Cr-Mo-V-type low-copper reactor pressure vessel material. 15Kh2MFA was microstructurally tested as received and in three different irradiation states within the frame of the LONGLIFE project. The following microstructural tests were performed: metallography, fractography, transmission electron microscopy, small angle neutron scattering, and atom-probe tomography. The aim of the current paper is to summarize the results that were evaluated by the six European institutes performing the study. The SANS tests show that the cluster volume fraction growth is nearly linear as a function of the fluence, and atom-probe tomography concludes that vanadium carbide precipitations were already originally present in the as-received steel. During irradiation these precipitates are enriched with Mo, Cu, and Cr. At the highest dose Mn, Si, and Ni are also attached to these clusters.

    Keywords:

    irradiation, microstructural testing, dislocations, clusters, precipitations


    Author Information:

    Gillemot, Ferenc
    Centre for Energy Research of the Hungarian Academy of Sciences, Budapest,

    Horváth, Ákos
    Centre for Energy Research of the Hungarian Academy of Sciences, Budapest,

    Horváth, Márta
    Centre for Energy Research of the Hungarian Academy of Sciences, Budapest,

    Kovács, Attila
    Centre for Energy Research of the Hungarian Academy of Sciences, Budapest,

    Radiguet, Bertrand
    Groupe de Physique des Matériaux, UMR CNRS 6634, Université et INSA de Rouen, Rouen,

    Cammelli, Sebastiano
    Groupe de Physique des Matériaux, UMR CNRS 6634, Université et INSA de Rouen, Rouen,

    Pareige, Philippe
    Groupe de Physique des Matériaux, UMR CNRS 6634, Université et INSA de Rouen, Rouen,

    Mayoral, Mercedes Hernández
    CIEMAT, Madrid,

    Ulbricht, Andreas
    Helmholtz-Zentrum Dresden-Rossendorf e.V., Dresden,

    Kresz, Norbert
    Nuclear Power Plant, Paks,

    Oszwald, Ferenc
    Nuclear Power Plant, Paks,

    Török, Gyula
    Wigner Research Center for Physics of the Hungarian Academy of Sciences, Budapest,


    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP157220130098